Sound-reproducing-device construction



Sept. 6, 1927, 1,641,667

J. B. ELENSCHNEIDER' SOUND REPRODUCING DEVICE CONSTRUCTION Filed Jan. 2, 1926 j v Q avmtoz Patented Sept. 6, 1927.

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JOHN B. ELENSCHNEIDER, 0F BROOKLYN, NEW YORK, ,ASSIGNOR TO DE FOREST RADIO I COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF DELAWARE.

SOUND-REPRODUCING-DEVICE CONSTRUCTION.

Application filed January This invention relates broadly to sound reproducing devices. r One of the objects of U115 invention 1s the provision of new and novel means for con- 5 structing sound reproducing devices of the type used in-radio receiving circuits and in the talking motion picture art. y A further object of this invention is the provision of a new means for connecting together the vibration producing means and the vibratile membrane of devices of this t eh dlnother object of this invention is the rovision of a novelstructureby means of which amplitude of vibrations of the vibration producing elements is reduced by means of a novel construction tying the vibration producing means to the vibrating membrane.

ments clearly disclosed.

' perspective view of the v1brat-.

Fig. 3 1s a ing reed connection. a

At 1 is shown a vibratile membrane conical in form, although it will be understood that I do not desire to be limited to this particular shape of membrane, mounted on a flat ring of flexible material 2, which in turn is rigidly secured between two heavy circular rings 3- and 4 at its outer edge. Secured to the apex of the cone is a small metal member 5 on which is secured connecting rod 6. Mounted within a casing 7, having a flared annular rim 8 are two electro-magnets l3. Secured to the flange 8 and extending across the open end of the container 7 is a reed or membrane 10 upon which'is mounted by means of two short pins 12 a small an le bar 11. The angle bar 11 is secured to fire connecting rod 6 at the end opposite to which it is connected to the metal member 5. At 14 is shown a cable used to electrically 2, 1926. Serial N0. 78,727.

connect the magnets 13 with an external circuit. a

One of the important features of this invention is the method of mounting the short bar 11 on the diaphragm or reed 10. This is accomplished by means of the short pins 12 which are rigidly secured to these elements. It is by means of this arrangement that I effect a reduction-in the amplitude of vibrations between the member 10 and the membrane 1. The amount of this reduction depends upon the distance between the pins 12 for a given size and thickness of the reed. By this construction, the connecting rod 6 mounted between the pins 12 moves at a reduced amplitude depending upon the distance between the pins 12 and the thickness of the membrane or reed 10. v

The reed 10 may be made of a magnetic material or of a non-magnetic material, such as bronze or other resilient substance. If a non-magnetic material or substance is used, a small piece of magnetic material may be attached to its center so that it will be influenced by the electromagnets.

The diaphragm, of course, may be made of pa er, metal, treated cloth or any other material suitable for the reproduction of sound. It may be attached to the flat flexible ring 2 at its outer edge by means of cement or any other suitable or desirable means.

It will thus be evident that I have pro-- duced an exceedingly simple arrangement by means of which the vibrations transmitted from the vibration producing means to the vibratile membrane may be reduced in amplitude by or to any desired amount. It will, of course, be evident to one skilled in the art that many changes in details of construction and arrangement of parts will readily occur without involving invention. Therefore I do not desire to be limited to the particular construction disclosed and described by me' but rather by the spirit and scope of the claims.

What I seek to secure by United States Letters Patent is: r

1. An electro-magnetic motor comprising a casing, electro-magnets in said casing, a reed mounted on said casing, an an le bar attached to said reed at two relative y distant points, and a rod secured to said bar between the points of attachment.

2. In a sound reproducing device, the

combination of vibrating means, a conical membrane secured at its edge to a ring of flexible material and intermediate to its edges, a heavy support for said ring, and means attached at one point to said membrane and at a plurality of points to said vibrating means.

3. In a sound reproducing device, the combination of a vibratile membrane, electrical means for vibrating said membrane comprising eleet-ro-magnets, a diaphragm mounted near said magnets, a bar mounted on said diaphragm and serured thereto by two short pins, and means for attaching said bar to said diaphragm.

4.111 a sound reproducing device, the combination of a vibratile membrane, electrical means for vibrating said membrane eanne? comprising eleetro-magnefis, a diaphragm mounted near said magnets, a bar mounted on said diaphragm and secured thereto by two short pins, means for attaching said bar to said diaphragm, and a flat flexible ring mounted in a support and secured tovsaid membrane. 7

5. Means for reducing the amplitude of vibrations of a sound reproducing device comprising an armature and a V-shaped her, said bar being rigidly secured to said armature by pins adjacent each end of the bar and said bar being displaced from said armature,

In testimony Whereofll have hereunto set my hand on this twenty-fourth day of December, A. D, 1925.

JUHN B. ELENSCHNEIDER. 

